ASTM A789 S32205 Duplex Stainless Steel Tube for Heat Exchanger Tube Bundles
Yuhong Group Co., Ltd. supplies heat exchangers, pressure vessels, air coolers, tube bundles, U-tubes, heat exchanger tubes, finned tubes, tubesheets, baffles, and heads. This page focuses on ASTM A789 S32205 tube for heat exchanger and pressure equipment service.
Under ASTM A789/A789M, S32205 is a ferritic/austenitic stainless steel tube grade supplied in average wall thickness, or minimum wall thickness when specified on the order. Tubes are made by the seamless or welded process with no filler metal added. The grade is selected for services requiring general corrosion resistance, with particular emphasis on resistance to stress corrosion cracking. A789/A789M also notes that these steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures.
Common search terms include ASTM A789 S32205 tube, duplex stainless steel heat exchanger tube, S32205 U-bend tube, and ASTM A789 tube bundle.
| Element | S32205 |
|---|---|
| C | 0.030 max |
| Mn | 2.00 max |
| P | 0.030 max |
| S | 0.020 max |
| Si | 1.00 max |
| Ni | 4.5–6.5 |
| Cr | 22.0–23.0 |
| Mo | 3.0–3.5 |
| N | 0.14–0.20 |
| Item | S32205 |
|---|---|
| Heat treatment | 1020–1080°C [1870–1975°F] |
| Quench | Rapid cooling in water or by other means |
| Tensile strength, min | 94 ksi [650 MPa] |
| Yield strength, min | 65 ksi [450 MPa] |
| Elongation in 2 in. or 50 mm, min | 30% |
| Hardness, max | 290 HBW / 30 HRC / 290 HV |
| Manufacture | Seamless or welded, no filler metal added |
| Testing | Each tube: hydrostatic or nondestructive electric test, unless otherwise specified |
| Property | S32205 | S31803 |
|---|---|---|
| Cr, % | 22.0–23.0 | 21.0–23.0 |
| Mo, % | 3.0–3.5 | 2.5–3.5 |
| N, % | 0.14–0.20 | 0.08–0.20 |
| Tensile strength, min | 94 ksi [650 MPa] | 90 ksi [620 MPa] |
| Yield strength, min | 65 ksi [450 MPa] | 65 ksi [450 MPa] |
| Elongation, min | 30% | 25% |
| Hardness, max | 290 HBW / 30 HRC / 290 HV | 290 HBW / 30 HRC / 290 HV |
This comparison helps buyers specify S32205 when higher Cr, Mo, and N ranges and higher minimum tensile and elongation are required by the A789/A789M tables. It is not a cross-standard equivalence.
Compliance: ASTM A789/A789M.
In shell-and-tube heat exchangers, air coolers, and pressure vessel tube bundles, ASTM A789 S32205 tube can be used for straight tubes, U-tubes, finned tubes, and replacement tube bundles. The Cr-Mo-N chemistry and A789/A789M heat treatment support general corrosion resistance and stress corrosion cracking resistance in process-side and cooling-water services where SCC is a selection concern. Each tube is subjected to hydrostatic or nondestructive electric testing, which helps screen tube integrity before bundle assembly. For high-temperature projects, review the A789/A789M warning on prolonged elevated-temperature embrittlement.
- Heat exchanger tubes and tube bundles
- U-tube heat exchangers
- Air cooler tubes
- Finned tubes for process plants
- Replacement tubes for pressure equipment and heat transfer service
A: A789/A789M covers both seamless and welded tube. Welded tube is made with no filler metal added.
A: 1020–1080°C [1870–1975°F], followed by rapid cooling in water or by other means.
A: A789/A789M states these steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures. Review actual operating conditions before selection.
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